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authorGuillaume Gomez <guillaume1.gomez@gmail.com>2024-12-05 23:47:10 +0100
committerGitHub <noreply@github.com>2024-12-05 23:47:10 +0100
commite941e73368866d3ecc98f040d9f1376de7efcdf1 (patch)
tree5fcedf74d7e6e829089b77b9b197a64290c013bf /src/bootstrap/bootstrap.py
parent7416c337803f8c4a2a7c9d1fb1603dda3d941ab9 (diff)
parent144d6cc65ba5d3ebdf1e20cc1a27bd3964402921 (diff)
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Rollup merge of #133607 - WaffleLapkin:tail-call-checks, r=compiler-errors
implement checks for tail calls

Quoting the [RFC draft](https://github.com/phi-go/rfcs/blob/guaranteed-tco/text/0000-explicit-tail-calls.md):

> The argument to become is a function (or method) call, that exactly matches the function signature and calling convention of the callee. The intent is to ensure a matching ABI. Note that lifetimes may differ as long as they pass borrow checking, see [below](https://github.com/phi-go/rfcs/blob/guaranteed-tco/text/0000-explicit-tail-calls.md#return-type-coercion) for specifics on the return type.

> Tail calling closures and tail calling from closures is not allowed. This is due to the high implementation effort, see below, this restriction can be lifted by a future RFC.

> Invocations of operators were considered as valid targets but were rejected on grounds of being too error-prone. In any case, these can still be called as methods.

> Tail calling [variadic functions](https://doc.rust-lang.org/beta/unstable-book/language-features/c-variadic.html) and tail calling from variadic functions is not allowed. As support for variadic function is stabilized on a per target level, support for tail-calls regarding variadic functions would need to follow a similar approach. To avoid this complexity and to minimize implementation effort for backends, this interaction is currently not allowed but support can be added with a future RFC.

-----

The checks are implemented as a query, similarly to `check_unsafety`.

The code is cherry-picked straight out of #112657 which was written more than a year ago, so I expect we might need to change some things ^^"
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